:root {
  --bg: #f7f7f5;
  --fg: #1d1d1f;
  --muted: #6b6b70;
  --card: #ffffff;
  --line: #e2e2e0;
  --accent: #b3261e;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121214;
    --fg: #ececee;
    --muted: #9a9aa0;
    --card: #1c1c1f;
    --line: #2e2e33;
    --accent: #ff6b5e;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  line-height: 1.8;
  padding: 32px 16px 64px;
}
main { max-width: 720px; margin: 0 auto; }
header { display: flex; align-items: center; gap: 16px; margin-bottom: 32px; }
header img { width: 72px; height: 72px; border-radius: 16px; }
header h1 { margin: 0; font-size: 1.5rem; line-height: 1.3; }
header p { margin: 0; color: var(--muted); font-size: 0.9rem; }
h2 { font-size: 1.15rem; margin: 40px 0 8px; padding-bottom: 6px; border-bottom: 1px solid var(--line); }
h3 { font-size: 1rem; margin: 24px 0 4px; }
a { color: var(--accent); }
ul { padding-left: 1.4em; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 20px;
  margin: 16px 0;
}
.links { display: grid; gap: 12px; }
.links a { display: block; text-decoration: none; font-weight: 600; }
.links span { display: block; color: var(--muted); font-weight: 400; font-size: 0.9rem; }
.meta { color: var(--muted); font-size: 0.9rem; }
hr { border: none; border-top: 1px solid var(--line); margin: 56px 0 24px; }
footer { color: var(--muted); font-size: 0.85rem; margin-top: 48px; }